Zone specific remote control panel for loading dock equipment

ABSTRACT

A loading dock apparatus remote control is provided. Some embodiments of the invention include a zone specific remote control for loading dock apparatus. Some optional embodiments include a selector switch to select which apparatus the single set of controls will control. Other optional embodiments automatically select the apparatus to be controlled by the single set of controls. A method of operating loading dock apparatus using a remote control is also provided.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to and is a continuation-in-part, oftwo U.S. patent applications both entitled, Master Control Panel forLoading Dock Equipment, both filed Apr. 18, 2002, having Ser. Nos.10/124,594 and 10/124,593 both pending, the disclosures of which arehereby incorporated by reference in their entirety.

FIELD OF THE INVENTION

The present invention relates generally to control panels for loadingdock equipment. More particularly, the present invention relates to azone specific remotely operated control panel for operating loading dockequipment.

BACKGROUND OF THE INVENTION

Some embodiments of the invention are directed to a master control panelwhich simplifies the operation of loading dock equipment. In addition tohaving a dock leveler and overhead door, a loading dock may also have avehicle restraint, loading light, barrier gate and inflatable shelter.If the various devices are power operated rather than manually operated,the wall beside the doorway may be cluttered with various controlpanels. Not only is the space between doors often very restricted, butthe cost of the electrical installation can be significant. Thissituation can be improved with the installation of a combination controlpanel which includes all of the controls in a single enclosure. Thecombination panel not only saves space but may also reduce the cost ofelectrical installation. One criticism of existing combination panelshas been that the operator may be confused by the various number ofswitches and push buttons, and the proper sequence of operation.

DESCRIPTION OF RELATED ART

FIG. 1 illustrates a loading dock with a driveway 1, dock face 2, dockfloor 3. A pit 4 is recessed in the floor 3. A dock leveler assembly 10has a deck assembly 11, and a frame assembly 12 which is mounted in thepit 4. Lip keepers 14 are mounted to the front of the frame. The rear ofa deck assembly 11 pivots on the frame assembly 12 and has a lip hinge13 at the front. In the storage position, a lip assembly 15 is supportedat one end by the lip hinge 13 and has the other end resting on the lipkeepers 14.

The doorway of the loading dock can be closed by a movable door 18,shown partially open. A vehicle restraint assembly 20 is mounted to thedock face 2 and has a hook 21, which moves vertically to engage the RIGof a truck or tractor trailer (not shown). A light assembly 23 ismounted beside the doorway and has a red light 24 and a green light 25to signal the truck driver. Two signs 26 and 27 instruct the driver tomove only when the green light is illuminated. The sign 26 has reversedlettering to be legible when viewed in the truck mirror. A loading light28 is mounted beside the doorway to illuminate the interior of thetrailer during loading. A barrier gate assembly 30 has a barrier arm 31which moves from a horizontal position where it prevents access to thedoorway to a vertical position where it allows access to the doorway.

An inflatable shelter assembly 35 has two side bags 36 and a head bag 37which are inflated by a motor and blower (not shown). When a truck ortrailer is at the dock, the bags inflate to form a seal between thetruck or trailer and the dock wall.

FIG. 2 demonstrates a typical loading dock area with control panels fora hydraulic dock leveler, electric vehicle restraint and power operateddoor. The dock leveler control panel 40 has three buttons, button 41raises the dock leveler deck assembly 11, button 42 extends the hingedlip plate 15, and button 43 is an Emergency Stop which stops all of thedock leveler functions. The vehicle restraint control panel 50 has aselector switch 51, an engage button 52 and a release button 53. Threelights 55, 56 and 57 which are red, amber and green respectively,indicate to the dock operator the status of the vehicle restraint. Theselector switch 51 has three positions, Off, On, and Lights Only, whichallows the operator to bypass the vehicle restraint if the truck ortrailer cannot be captured by the vehicle restraint and must berestrained by wheel chocks. The door control panel 60 has three buttons,an Open button 61, a Close button 63 and a Stop button 62.

The normal operating sequence of the equipment is as follows:

When the dock is not in use, the exterior green light 25 is illuminatedto indicate that the truck driver may approach or leave the dock. Theinterior red light 55 is illuminated to indicate that the dock is not ina condition for use. After a trailer backs in to be loaded or unloaded,the operator selects the vehicle restraint control panel 50 and pressesthe engage button 52. The vehicle restraint hook 21, of FIG. 1, rises toengage the truck or trailer rear impact guard. When the hook 21 startsto rise, the exterior red light 24 is illuminated to indicate that thetruck driver cannot leave. When the truck or trailer has beeneffectively restrained, the interior green light 57 is illuminated toindicate that the dock is ready to use. If the vehicle restraint 20cannot restrain the trailer, the dock operator must manually chock thetruck or trailer wheels. The operator may then turn the selector switch51 from On (or a normal position) to Lights Only position. Both theinterior green light 55 and amber light 56 are now illuminated toindicate that the dock is safe to use, but that the operator should usegreater caution because the vehicle restraint 20 has not engaged thetruck or trailer.

The operator selects the door control panel 60 and presses the Door Openbutton 61 to open the door 18.

The operator selects the dock leveler control panel 40 and presses theRaise button 41 to raise the deck assembly 11, extend the lip assembly15, and releases the button to lower the leveler onto the trailer.Pressing the Lip Extend button 42 allows faster operation by causing thelip 15 to extend before the deck assembly 11 is fully raised. Pressingthe Emergency Stop button 43 causes the dock leveler to stop so that itwill not descend on top of any misplaced cargo.

If a loading light 28 is installed it may have a manual switch or may beautomatically turned on when the door is opened. Similarly, aninflatable shelter 35 may be operated by a manual switch or beautomatically turned on when the door is opened.

When the loading operation is finished, the operating sequence isreversed.

The operator presses the dock leveler Raise button 41 to raise the deckassembly 11, fold the lip assembly 15 and then releases the button tolower the dock leveler to the stored position.

The operator presses the Door Close button 63 to close the door 18.Pressing the Stop button 62 causes the door to stop before it closes.

The operator presses the Release button 53 and the vehicle restrainthook 21 lowers to release the trailer. When the hook 21 starts to lower,the interior red light 55 is illuminated to indicate that the dock isnot ready for use. When the hook is fully lowered, the exterior greenlight 25 is illuminated to indicate that the truck driver may leave.

FIG. 3 demonstrates a typical combination control panel with controlsfor a hydraulic dock leveler, electric vehicle restraint and poweroperated door. The control buttons and switches have the identicalfunctions of the separate panels in FIG. 2. Often, a Programmable LogicController (PLC) is used to allow many different control sequences andinterconnect relationships. A PLC accepts input signals from variousdevices such as limit switches and push buttons and then transmitsoutput signals to various devices such as lights, relays and motors inaccordance with the logic defined by the control program. The use of aPLC is well known in the loading dock industry and the specificelectrical circuits and program statements are not shown nor discussedherein.

Although the control buttons and switches are arranged in functionalgroups and are clearly labeled, an untrained operator may find that thenumber of buttons and their differing locations make the proper sequenceof operations seem confusing. Therefore, this invention provides acombination panel with all of the advantages of compact space andeconomical installation, and with a simplified operating sequence.

Accordingly, it is desirable to provide a simplified combination panelfor controlling loading dock equipment and a method for operatingloading dock equipment with a simplified control panel.

Another problem associated with loading and unloading of cargo atloading docks involves the inability of a fork truck driver from beingable to operate the loading dock equipment while seated on the forktruck. In current systems, a fork truck driver must dismount from thefork truck and operate the loading dock equipment and then return to thefork truck to continue loading or unloading operations. Alternatively, asecond person operates the loading dock equipment while the fork truckdriver performs loading and unloading operations. The constant gettingin and out of the fork truck or the use of a second person to operatethe loading dock equipment can be inefficient.

Accordingly it is desirable to provide a system and method to permit afork truck driver to operate the loading dock equipment while seated onthe fork truck.

SUMMARY OF THE INVENTION

It is therefore a feature and advantage of some embodiments of thepresent invention to provide a combination panel with all of theadvantages of compact space and economical installation, but with asimplified operating sequence.

The above mentioned features, and other features and advantages areachieved through the use of a novel master control panel as hereindisclosed. In accordance with one embodiment of the present invention,the invention includes a unified controller for controlling a loadingdock apparatus comprising a control panel for providing a common areafor operator controls and signals; operator signal lights located on thecontrol panel and operatively connected to the loading dock apparatusfor signaling an operator that a loading dock is at least one of readyfor loading, not ready for loading, and operator be cautioned; aselector switch located on the control panel, and operatively connectedto the loading dock apparatus to permit selective operation of a vehiclerestraint, a dock door, and a leveler apparatus; a first operationcontrol attached to the control panel wherein the first operationcontrol engages the vehicle restraint when the selector switch isselected to operate the vehicle restraint, the first operation controlopens the dock door when the dock door is selected by the selectorswitch, and the first operation control controls the raising andlowering of the dock leveler to an operative and a stored position, andextends and retracts a lip portion of the dock leveler when the dockleveler is selected by the selector switch; a second operation controlattached to the control panel, wherein the second operation controlextends a lip portion of the dock leveler when the dock leveler isselected by the selector switch, the second operation control closes thedock door when the dock door is selected by the selector switch, thesecond operation control disengages the vehicle restraint when theselector switch is selected to operate the vehicle restraint, and; athird operation control attached to the control panel, wherein the thirdoperation control is an emergency stop control configured to stopoperation of the loading dock apparatus; operator indicator lightslocated on the control panel, wherein the indicator lights indicatewhich of the vehicle restraint, door, and dock lever the operationcontrols will activate; and a vehicle restraint bypass switch located onthe controller, wherein the vehicle restraint bypass switch mayselectively bypass the dock loading apparatus causing the firstoperation control to not engage the vehicle restraint, but activate theoperator control signal light to indicate at least one of ready forloading, and operator be cautioned, and the second operation control tonot disengage the dock loading apparatus.

In accordance with another embodiment of the present invention, theinvention includes a controller for controlling a loading dockapparatus, the apparatus including a vehicle restraint, a door, aloading light, a dock leveler, the controller comprising a control panelfor providing a common area for operator controls and signals; operatorsignal lights located on the control panel and operatively connected tothe loading dock apparatus for signaling an operator that a loading dockis at least one of ready for loading, not ready for loading, andoperator be cautioned; selector switch located on the control panel, andoperatively connected to the loading dock apparatus to permit selectiveoperation of a vehicle restraint, a dock door, and a leveler apparatus;a means for controlling the loading dock apparatus, the means attachedto the control panel, wherein the means controls the vehicle restraintwhen the selector switch is selected to operate a vehicle restraint, themeans controls a dock door when the dock door is selected by theselector switch, and the means controls a dock leveler when the dockleveler is selected by the selector switch; an emergency stop controlattached to the control panel, configured to stop operation of theloading dock apparatus; operator indicator lights located on the controlpanel, wherein the indicator lights indicate which of the vehiclerestraint, door, and dock lever the operation controls will activate;and a vehicle restraint bypass switch located on the controller, whereinthe vehicle restraint bypass switch may selectively bypass the dockloading apparatus causing the means to not control the vehiclerestraint, but activate the operator control signal light to indicate atleast one of ready for loading, and operator be cautioned, when thevehicle constraint is engaged or bypassed and control signal light toindicate that the dock is not ready for loading when the vehiclerestraint is not engaged and not bypassed.

In accordance with another embodiment of the present invention, theinvention includes a method of controlling a loading dock apparatus witha single unified controller comprising configuring a first and secondoperation control to control a dock door by selecting a dock door optionwith a selecting switch; operating a dock door by operating the firstoperation control to open the dock door and operating the secondoperation control to close the dock door; configuring the first andsecond operation control to operate a dock leveler by selecting a dockleveler option with the selecting switch; operating a dock leveler byraising and lowering a dock leveler by operating the first operationcontrol and extending and retracting a lip portion of the dock levelerand extending a lip portion of the dock leveler by operating the secondoperation control.

In accordance with another embodiment of the present invention, theinvention includes a control panel for a loading dock apparatuscomprising; an operator means located on the control panel for operatinga loading dock apparatus, a controller means associated with the controlpanel for causing the operator means to operate at least two of avehicle restraint, a loading dock door, a loading dock door seal, and adock leveler and lip in a predetermined sequence, wherein the operatormeans, when activated, activates the loading dock apparatus to beoperated next in a predetermined sequence.

In accordance with another embodiment of the present invention, theinvention includes a control panel for a loading dock apparatuscomprising; an operator means located on the control panel for operatinga loading dock apparatus, a selector means located on the control panelfor selection between at least two of a vehicle restraint, a loadingdock door, a loading dock door seal, and a dock leveler and lip, whereinthe selector means causes the operator means, when activated, to operatethe loading dock apparatus that is selected by the selector means.

It is therefore a feature and advantage of some embodiments of thepresent invention to provide a method and apparatus that permits a forktruck operator operate loading dock equipment from with in a fork truck.Other embodiments of the invention include features and advantages suchas operating loading dock equipment associated with several differentdock bays with the same equipment but only one bay at a time. Otherembodiments of the invention include features and advantages such as acombination panel with all of the advantages of compact space andeconomical installation, but with a simplified operating sequence andoperable from in a fork truck.

In accordance with another embodiment of the present invention, a remotecontrol system is provided. The system comprises: a receiver operativelyconnected to equipment to be controlled by the system; a remote controlconfigured to communicate with the receiver to control the equipment; atransmitter operatively connected to the remote control; and a zonedefined by at least one receiver and remote control wherein the remotecontrol and the receiver communicate with each other when thetransmitter is located in the zone and can not communicate with eachother when the transmitter is not in the zone; and the zone is notdefined by a range associated with the transmitter.

In accordance with another embodiment of the present invention, aloading dock control system is provided. The system comprises: aninfrared transmitter attachable to a fork truck and configured totransmit an infra red signal substantially straight up; a remote dockloading equipment controller operatively connected to the transmitter;and a receiver mountable with in a loading dock such that when mounted,the receiver will only be able to receive a signal from the transmitterwhen the transmitter is located with in a defined zone, the receiverconfigured to be operatively connected to a control panel located at theloading dock and controlling loading dock equipment.

In accordance with another embodiment of the present invention, acontrol system is provided. The system comprises: means for transmittingattachable to a fork truck and configured to transmit a signalsubstantially straight up; equipment controlling means operativelyconnected to the transmitting means; and receiving means mountablewithin a loading dock such that when mounted, the receiving means willonly be able to receive a signal from the transmitting means when thetransmitting means is located within a defined zone, the receiving meansconfigured to be operatively connected to a control panel located at theloading dock and controlling loading dock equipment.

In accordance with another embodiment of the present invention, a methodof remotely controlling dock loading equipment is provided. The methodcomprises operating loading dock equipment with a controller located ona fork truck.

In accordance with another embodiment of the present invention, a remotecontroller for loading dock apparatus is provided. The remote controllercomprises: a signal transmitter configured to transmit a signalwirelessly to a remotely located receiver operatively connected toloading dock apparatus; and at least one actuator operatively connectedto the signal transmitter and configured to, when actuated, send acontrol signal to the signal transmitter for transmission to thereceiver to cause loading dock apparatus to function according to thesignal.

In accordance with another embodiment of the present invention, a remotecontroller for loading dock apparatus is provided. The remote controllercomprises: means for transmitting a signal configured to transmit asignal wirelessly to a remotely located receiver operatively connectedto loading dock apparatus; and means for generating a signal operativelyconnected to the signal transmitting means and configured to, whenactuated, send a control signal to the signal transmitting means fortransmission to the receiver to cause loading dock apparatus to functionaccording to the signal.

In accordance with another embodiment of the present invention, a methodof remotely operating loading dock equipment is provided. The methodcomprises: configuring a single controller to operate a plurality ofloading dock apparatus; and transmitting a control signal from thecontroller to a transmitter and transmitting the control signal over awireless connection from the transmitter to a remote receiveroperatively connected to the loading dock equipment.

There has thus been outlined, rather broadly, the more importantfeatures of the invention in order that the detailed description thereofthat follows may be better understood, and in order that the presentcontribution to the art may be better appreciated. There are, of course,additional features of the invention that will be described below andwhich will form the subject matter of the claims appended hereto.

In this respect, before explaining at least one embodiment of theinvention in detail, it is to be understood that the invention is notlimited in its application to the details of construction and to thearrangements of the components set forth in the following description orillustrated in the drawings. The invention is capable of otherembodiments and of being practiced and carried out in various ways.Also, it is to be understood that the phraseology and terminologyemployed herein, as well as the abstract, are for the purpose ofdescription and should not be regarded as limiting.

As such, those skilled in the art will appreciate that the conceptionupon which this disclosure is based may readily be utilized as a basisfor the designing of other structures, methods and systems for carryingout the several purposes of the present invention. It is important,therefore, that the claims be regarded as including such equivalentconstructions insofar as they do not depart from the spirit and scope ofthe present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 a perspective view of a loading dock with dock leveler, door,vehicle restraint, barrier gate, loading light and inflatable shelter;

FIG. 2 is a front view of a typical dock wall with multiple controlpanels;

FIG. 3 is a front view of combination control panel having multiplecontrols for different pieces of equipment;

FIG. 4 is a front view of one optional embodiment of a combinationcontrol panel in accordance with the invention with a simplifiedoperating sequence;

FIG. 5 is a front view a second optional embodiment of combinationcontrol panel in accordance with the invention with a simplifiedoperating sequence;

FIG. 6 is a front view of a third optional embodiment of a combinationcontrol panel in accordance with the invention with a simplifiedoperating sequence;

FIG. 7 is a front view of a fourth optional embodiment of a combinationcontrol panel in accordance with the invention with automatic features;

FIG. 8 is a front view of several optional manual select switches;

FIG. 9 is a front view of an optional configuration of manual selectswitches;

FIG. 10 is a front view of an optional selector switch for selectingdifferent operating modes.

FIG. 11 is a side view of a loading dock with the loading dock equipmentcontrol system installed in accordance with the invention.

FIG. 12 is a top view of a loading dock with the loading dock equipmentcontrol system installed in accordance with the invention illustratingthe remote control zone.

FIG. 13 is a side view of a signal receiver/transmitter in accordancewith one embodiment of the invention illustrating the conicaltransmitting and receiving zone.

FIG. 14 is a side view of a loading dock with a loading dock equipmentcontrol system installed in accordance with another embodiment of thepresent invention.

FIG. 15 is a top view of a loading dock with a loading dock equipmentcontrol system in accordance with another with the invention wheremultiple transmitter/receivers are used.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

In accordance with a first optional embodiment of the invention, FIG. 4shows a control panel 70 a which operates a hydraulic dock leveler 10,FIG. 1, vehicle restraint 20 and power operated door 18. The panel has aselector switch 71 with three positions, Restraint, Door, Dock Leveler,push buttons 72, 73 and 74, (which may be referred to as operationcontrols, in other embodiments the operation controls may include othertypes of operation controls than push buttons such as levers, switches,turn key operators or other common input devices) and three indicatorlights 75, 76, 77. An array of 6 operating symbols 81 through 86indicate the operational functions of each button. Three lights 65, 66and 67 (which may be referred to as operator signal lights) which arered, amber and green respectively, indicate to the dock operator thestatus of the vehicle restraint. A selector switch 78 provides an bypassfor the vehicle restraint 20 similar to the Lights Only position of theselector switch 51 on the conventional vehicle restraint control panel50.

The normal operating sequence of the dock equipment is in the same orderas described above, but there are fewer control buttons and theoperation sequence is presented in a more logical sequence. The interiorlights 65, 66 and 67, and the exterior lights 24 and 25 have the samefunctions for all of the control panels in this application and will notbe described again.

The operator turns the selector switch 71 to Restraint. The indicatorlight 75 is illuminated to indicate that the symbols for the vehiclerestraint, 81 and 82 in the first column, are in effect.

The operator presses the button 72 to cause the vehicle restraint hook21 to rise and engage the truck or trailer.

The operator turns the selector switch 71 to Door. The indicator light76 is illuminated to indicate that the symbols for the door, 83 and 84in the second column, are in effect.

The operator presses the button 72 to open the door 18.

The operator turns the selector switch 71 to Dock Leveler. The indicatorlight 77 is illuminated to indicate that the symbols for the dockleveler, 85 and 86 in the third column, are in effect.

The operator presses the button 72 to raise the deck assembly 11, extendthe lip assembly 15, and releases the button to lower the leveler ontothe truck or trailer. Pressing the button 73 allows faster operation bycausing the lip assembly 15 to extend before the deck assembly 11 isfully raised.

When the loading operation is finished, the operating sequence isreversed.

The operator presses the button 72 to raise the deck assembly 11 andretract the lip assembly 15 and then releases the button to lower theleveler 10 to the stored position with the lip assembly 15 resting onthe lip keepers 14.

The operator turns the selector switch 71 to Door. The indicator light76 is illuminated to indicate that the symbols for the door are ineffect.

The operator presses the button 73 to close the door 18.

The operator turns the selector switch 71 to Restraint. The indicatorlight 75 is illuminated to indicate that the symbols for the vehiclerestraint are in effect.

The operator presses the button 73 to cause the vehicle restraint hook21 to lower to release the truck or trailer.

The three positions of the selector switch 71 and illumination of thelights 75, 76 and 77 clearly separate the functions of the variousdevices and illustrate the proper operational sequence.

Description of a second optional embodiment.

FIG. 5 shows a control panel 70 b which is similar to the panel 70 a inFIG. 4 but has additional functions. The panel has selector switches 71and 78, push buttons 72, 73 and 74, and three indicator lights 75, 76,77. An array of 6 operating symbols 81 through 86 indicate theoperational functions of each button. In addition there is a selectorswitch 79 which has 3 positions Off, Automatic and Manual. Turning theselector switch 79 to the Off position shuts off electrical power to theentire control panel 70 b. When the selector switch 79 is turned toManual, the three positions of selector switch 71 (Restraint, Door,Leveler) have the same functions as previously described for panel 70 a.Turning the selector switch 79 to the Automatic position provides asimplified, more automated sequence of operations. When the vehiclerestraint 20 is stored, the indicator light 75 is illuminated toindicate that the symbols for the vehicle restraint, 81 and 82 in thefirst column, are in effect.

The operator presses the button 72 to cause the vehicle restraint toengage the truck or trailer.

When the vehicle restraint 20 has engaged the truck or trailer, theindicator light 76 is automatically illuminated to indicate that thesymbols for the door, 83 and 84 in the second column, are in effect.

The operator presses the button 72 to open the door 18.

When the door 18 has opened or begins to open, the indicator light 77 isautomatically illuminated to indicate that the symbols for the dockleveler, 85 and 86 in the third column, are in effect.

The operator presses the button 72 to place the leveler on the truck ortrailer. Pressing the button 73 allows faster operation by causing thelip 15 to extend before the leveler 10 is fully raised.

When the loading operation is finished, the operating sequence isreversed.

The operator presses the button 72 to raise the leveler, fold the lip 15and then releases the button to lower the leveler 10 to the storedposition.

When the leveler 10 is properly stored, the indicator light 76 isautomatically illuminated to indicate that the symbols for the door arein effect.

The operator presses the button 72 to close the door 18.

When the door 18 is fully closed, the indicator light 75 is illuminatedto indicate that the symbols for the vehicle restraint 20 are in effect.

The operator presses the button 73 to cause the vehicle restraint 20 torelease the truck or trailer.

Thus the entire operational sequence can be performed by simply pressingbuttons 72 and 73 in the proper sequence as indicated by the lights 75,76 and 77 and the graphical symbols 81 through 86 associated with eachbutton.

Description of a third optional embodiment.

FIG. 6 shows a control panel 70 c which is similar to the panel 70 b inFIG. 4 but has additional functions. The panel has selector switches 71and 78, push buttons 72, 73 and 74, and three indicator lights 75, 76,77. The selector switches 71 and 78 have the same positions andfunctions as previously described. This control panel also controlsadditional equipment including a barrier gate 31, an inflatable shelter35 and a loading light 28. Selector switch 87 has three positions Raise,Automatic and Lower. When the Automatic position is selected, thebarrier gate 31 is automatically raised (also referred to as disengaged)when vehicle restraint 20 has secured the truck or trailer andautomatically lowers (also referred to as engaged) before the vehiclerestraint 20 releases the truck or trailer. It is to be understood thatwhile the barrier is shown in FIG. 1 as a gate, in other embodiments ofthe invention the barrier could be in forms other than a gate. Inembodiments with other types of barriers the controller will engage anddisengage the barrier. Similarly, selector switch 88 has three positionsOff, Automatic and On to control the inflatable shelter 35. When theAutomatic position is selected, the shelter 35 is automatically inflatedwhen the door 18 is opened and is allowed to deflate when the door 18 isclosed. When the Off position is selected, the shelter 35 is disabled,and remains off when the remaining dock loading apparatus is operating.

Selector switch 89 has three positions Off, Automatic and On to controlthe loading light 28. When the Automatic position is selected, theloading light 28 is automatically turned on when the door 18 is openedand is turned off when the door 18 is closed. When the Off position isselected the loading light 28 is disabled and remains off when theremaining dock loading apparatus is operating.

The Raise and Lower positions of selector switch 87, and the Off and Onpositions of selector switches 88 and 89 allow manual control of thebarrier gate 30, the inflatable shelter 35 and the loading light 28. Forexample, the operator may wish to leave the door 18 open and the shelter35 to remain deflated for ventilation in hot weather, or the selectorswitches may be used to manually operate each device independently forinspection or maintenance. The selector switch 79 may have positionsManual and Automatic. When the Manual position is selected, the door 18can be left open for ventilation in hot weather. Also, a selector switch109 as shown in FIG. 10 may be included on the control panel 70 c tooperate individual pieces of equipment. When the selector switches areall set to Automatic, the operation is now:

When the vehicle restraint is stored, the indicator light 75 isilluminated to indicate that the symbols for the vehicle restraint, 81and 82 in the first column, are in effect.

The operator presses button 72 to cause the vehicle restraint 20 toengage the truck or trailer.

When the vehicle restraint 20 has engaged the truck or trailer, thebarrier gate 30 automatically raises and the indicator light 76 isautomatically illuminated to indicate that the symbols for the door, 83and 84 in the second column, are in effect.

The operator presses the button 72 to open the door 18.

When the door 18 starts to open, the inflatable shelter 35 automaticallystarts to inflate. When the door 18 has fully opened, the loading light28 is automatically turned on and the indicator light 77 isautomatically illuminated to indicate that the symbols for the dockleveler, 85 and 86 in the third column, are in effect.

The operator presses the button 72 to raise the leveler 10 and releasesthe button 72 to lower the leveler on to the truck or trailer. Pressingthe button 73 allows faster operation by causing the lip 15 to extendbefore the leveler 10 is fully raised.

When the loading operation is finished, the operating sequence isreversed.

The operator presses button the 72 to raise the leveler 10, fold the lip15 and then releases the button to lower the leveler 10 to the storedposition.

When the leveler 10 is properly stored, the indicator light 76 isautomatically illuminated to indicate that the symbols for the door arein effect.

The operator presses the lower button 73 to close the door 18. As thedoor 18 starts to close, the loading light 28 is automatically turnedoff.

When the door 18 is fully closed, the inflatable shelter motor stops andthe shelter 35 starts to deflate, and the indicator light 75 isilluminated to indicate that the symbols for the vehicle restraint arein effect.

The operator presses button 73 to cause the vehicle restraint 20 torelease the truck or trailer. The barrier gate 30 automatically lowersand then the vehicle restraint 20 releases the truck or trailer.

Thus the entire operational sequence can be performed by simply pressingbuttons 72 and 73 in the proper sequence as indicated by the lights 75,76 and 77 and the graphical symbols associated with each button.

Although the door 18 and inflatable shelter 35 operation can becontrolled automatically, additional selector switches 106 and 88 canprovide over-ride or by-pass functions to allow the door 18 to remainopen or the inflatable seal 35 to remain deflated for ventilation in hotweather.

It is evident from the previous descriptions that there can be manyvariations in the dock equipment and sequence of operations. However,having multiple functions provided by the repeated presses of a singlebutton provides control of the sequences and simplifies the operation.

Automatic Control for Loading Dock Equipment.

Description of a fourth optional embodiment.

FIG. 7 shows a control panel 100 which has an even more simplifiedoperation sequence. Three lights 65, 66 and 67 which are red, amber andgreen respectively, indicate to the dock operator the status of the dockequipment. The inside red light 65 indicates that the truck or traileris not ready to load, and the inside green light 67 indicates that thetruck or trailer is ready to load. The inside amber light 66, eithersteady or flashing, may be used to indicate a truck present, operator becautioned, or error conditions. The selector switch 51 has twopositions, Normal and Lights Only which bypasses the vehicle restraint20 if the truck or trailer cannot be secured by the vehicle restraint20. The selector switch 51 may be momentarily in the Lights Onlyposition, then return by spring or other means to the Normal position. Apush button could be used in place of the selector switch.

This control panel 100 may control many loading dock devices which couldinclude a vehicle restraint 30, door 18, barrier gate 30, inflatableshelter 35 and a loading light 28. The control panel 100 also has twopush buttons, 101 labeled “A” and 102 labeled “B”. The push button 43operates a maintained contact Emergency Stop switch.

Operation of the equipment is controlled by a programmable controller.Such devices are well known in the industry and will not be described indetail. The basic requirement is that each piece of dock equipment hassufficient limit switches or sensors which send signals to thecontroller to indicate the state of equipment. The controller then sendssignals to enable the motors or actuators for the various devices. Forexample, a vehicle restraint 20 usually requires 3 sensors, one each toindicate that the vehicle restraint 20 is stored, fully raised, andwhether the rear impact guard (RIG) of the truck or trailer has beenengaged. Similarly a door 18 usually requires at least 2 sensors, one toindicate that the door 18 is closed, and another to indicate that it isfully opened. However a manually operated door 18 may require only onesensor to indicate whether it is fully opened, or raised high enough toclear the operating range of the dock leveler 10. When the properconditions have been achieved, the controller will then enable themotors or actuators which operate the next device. Such a control systemis very flexible and is not limited to specific devices or specificoperational sequences.

The sequence of operations will be described for a dock which has avehicle restraint 20, power operated door 18, barrier gate 30,inflatable shelter 35, loading light 28. Note that this document merelydescribes envisioned typical sequences of operations. In practice,sequences may be modified in accordance with the invention to suit aspecific customer requirement.

After a truck or trailer has been positioned at the dock door 18, theoperator presses the Arrival button 101 marked “A”. The vehiclerestraint 20 then starts to raise the restraining hook 21, and theoutside lights 23 change from green to red to indicate that the drivershould not move the vehicle. If the hook 21 cannot engage the RIG, theinside red and amber lights 55 and 56 will alert the operator. Theoperator should then secure the truck with manual wheel chocks or othermeans, and then turn the selector switch 51 to the Lights Only position(also referred to as a bypass position) to continue the operation. Ifthe RIG is secured, the operation will continue automatically. When thevehicle restraint 20 has engaged the trailer, the controller will thensend a signal to raise the door 18. As the door 18 starts to open, thecontroller will start the blower motor for the inflatable shelter 35.When the door 18 is fully opened, the controller will raise the barrierarm 31 to allow access to the truck or trailer, and turn on the loadinglight 28. When the barrier 31 is fully raised, the inside green light 67will indicate that the dock is ready to use. The operator may now usethe button 101 marked “A” to raise the dock leveler.

When the loading operation is finished, the operating sequence isreversed. The operator presses the “Truck Departure” button 102 marked“B” to initiate the sequence. The dock leveler 10 automatically raisesto fold the lip 15 and lowers to the stored position. When the leveler10 is properly stored, the operator again presses the button 102 marked“B” and the entire sequence will be reversed to lower the barrier, closethe door 18 and release the vehicle restraint 20. Additional operatingenhancements may be included in the control program. For example, thecontroller may require that the “Truck Departure” button be held forseveral seconds before the restoring sequence begins. This would preventoperation by someone inadvertently pressing the button. Also, an audiblealarm may be energized when the “Truck Departure” button is pressed towarn dock workers that the door is about to close and the truck will bereleased. Other enhanced features may include a time delay beforereleasing the vehicle restraint to ensure that the inflatable shelterhas had time to deflate.

Also, at any time the operator may push the Emergency Stop button 43.This will stop all operation of the equipment. When the problem has beenresolved, the operator will pull out Emergency Stop button 43 and thenmay press the “A” button to continue the operation or press the “B”button to restore the equipment to the initial state. Thus the entireoperational sequence can be performed by simply pressing the buttons 101and 102 without requiring the operator to make decisions about thesequence of operations.

Although this control system makes the operation very simple, it doesnot prevent the flexibility required for maintenance or specialoperating needs. This control system has the ability to provide specialoperating sequences.

For maintenance, there is often a requirement for independent operationof a specific device. For example, if the vehicle restraint 20malfunctions, there is a requirement to operate the vehicle restraint 20independently without initiating the door open sequence. FIG. 8 showsseveral selector switches which allow independent operation of theequipment used in the sequence described previously. Because maintenanceor selection of special operating features is usually restricted to moreskilled or supervisory personnel, these switches may be mounted on theexterior of the control panel 70 a, 70 b, 70 c, 100 and may becontrolled by keyed switches or they may be mounted inside the controlpanel 70 a, 70 b, 70 c, 100 for use only by maintenance personnel. Also,instead of a rotary style selector switch, other configurations, such asa slide switch 108 shown in FIG. 9, may be used for many of the switchesdescribed herein.

Operation of the maintenance switches will be described. Selector switch103 controls the operation the vehicle restraint 20. With the selectorswitch 103 in the Automatic position, operation is controlled by theprogrammable controller. Turning the selector switch 103 to the right orleft causes the vehicle restraint 20 to be raised or lowered by themaintenance technician. Similarly the selector switches 104, 105, 106,and 107 provide manual control of the barrier gate 30, door 18, doorseal 35 and loading light 28.

In the case of the dock light 28 and inflatable door seal 35, turningthe manual control to the off position for those features will cause thedock light 28 and door seal 35 to be disabled, and the controller willignore the dock light 28 and door seal 35 while automaticallycontrolling the other devices through their normal sequences.

FIG. 10 shows a simplified configuration with only a vehicle restraint20, door 18 and dock leveler 30. Instead of a separate selector switchfor each device, a single selector switch 109 allows use of the “A” and“B” buttons, 101 and 102, to raise or lower the device. Note that noselector switch position is required for the dock leveler because thedoor must be open before the dock leveler is used and turning theselector switch 51 to the lights only position allows the vehiclerestraint to be bypassed.

In addition to operation for maintenance, the selector switches may alsobe used to bypass or override any device (with the exception of thevehicle restraint were a lights only mode may be selected rather thannormal use of the restraint). For example, the selector switch 105 maybe used to manually control opening and closing of the door 18 formaintenance purposes. However, in some climates there may be a desire toleave the door 18 open on hot days. By turning the selector switch 105to the “Open” position, the door 18 will remain open and the controllerwill ignore the door 18 while automatically controlling the otherdevices through their normal sequences. Similarly the other devices suchas the barrier gate 30, door seal 35 and loading light 28 may bemanually controlled.

An optional feature of any of the embodiments may include a selectorswitch (not shown) which permits an operator to operate different dockbays with the same control panel. For example the selector switch maypermit an operator to select bay A, B, C, or the like.

While specific labels have been applied to positions of the variousselector switches and controls, those labels are meant to generallycharacterize the functions that will occur when various positions areselected. The specific labels themselves are not meant to be limitingthe invention to switches with those specific labels.

It is evident from the previous descriptions that there can be manyvariations in the dock equipment and sequence of operations. The numberof devices and operations is limited only by the number of input andoutput terminals on the controller. Having the functions operateautomatically in the correct sequence simplifies the operation of dockequipment for unskilled operators. The specific embodiments describedherein are exemplary. Features described herein may be added or deletedaccording to customer requirements and remain within the scope of theinvention.

According to another embodiment of the present invention a remotecontrol system 201 is provided. FIGS. 11-15 illustrate a loading dock200 in accordance with the present invention that includes a remotecontrol system 201 for remotely operating loading dock equipment. Theremote control system 201 allows dock workers such as fork truckoperators to activate the loading dock apparatus such as the vehiclerestraint, the dock leveler, the dock door, a barrier gate, lights andother loading dock equipment to be operated while seated on the forktruck. One important consideration in using remote control panels fordock equipment is to ensure that the remote control operates onlyequipment associated with the specific bay or portion of the loadingdock that is intended to be operated. For example, it may be undesirablefor dock worker working at a particular dock bay were to operateequipment located at bay several feet away where other operations wereoccurring. Therefore, in accordance with the invention, remote controlfor dock loading equipment operates only equipment associated with aparticular loading dock bay.

FIG. 11 shows a loading dock 200 equipped with a remote control system201. The loading dock 200 includes a dock floor 202, a dock ceiling 204and a dock wall 206. Within the dock floor 202 is a pit 207 in which adock leveler 208 is mounted. Attached to the dock wall 206, a dock door210 is provided. The dock door 210 opens in a similar way as a standardgarage door. In other words, it is mounted to rollers that ride up atrack allowing the dock door 210 to rise up to an overhead position.

Outside of the loading dock 200 is a vehicle restraint 212 configured toattach to vehicles parked at the loading dock 200. The vehicle restraint212 prevents vehicles from moving away from the loading dock 200 ascargo and equipment and moved in and out of the vehicle. While a hooktype vehicle restraint is shown, other vehicle restraints 212 such aswheel chocks and the like may also be used in accordance with thepresent invention.

The loading dock equipment (for example, a dock leveler 208, a dock door210 and a vehicle restraint 212) and other equipment are controlled by acontrol panel 214 mounted to the dock wall 206. In accordance with someembodiments of the present invention, the control panel 214 may be astandard control panel type of control panel as described previouslyherein, or any other suitable control panel. A remote control signalreceiver 220 is mounted to the loading dock ceiling 204.

As previously mentioned, a feature of some embodiments of the presentinvention is to permit remote control of dock equipment related to aspecific bay within a loading dock and to not inadvertently operate dockequipment associated with other bays within the loading dock 200. Forthe purposes of this description, the term “bay” refers to a portion ofa loading dock and associated equipment that is dedicated to the loadingand unloading of one vehicle parked at the dock. Optionally, a remotecontrol may operate equipment associated with several bays of a loadingdock but which bays are controlled and at which time the bays arecontrolled by a remote controller is pre-selected. For example, at afacility having 8 bays, an operator can select to operate only equipmentat bays 1, 2, 4 and 7. This feature may be useful in securityapplication such as a situation where an operator wants to shut and lockall of the dock doors at once.

Preferably, the remote control will operate equipment at only one bay ata time. To achieve this objective, the remote control system 201provides a zone 226 in which signals between a transmitter 218 and areceiver 220 can be received. If the transmitter 218 is located outsideof the zone 226 then any signals transmitted by the transmitter 218 willnot be received by the receiver 220 or in some embodiments of theinvention, the signal will be ignored.

In accordance with an embodiment of the present invention, the zone 226is conical in shape. The zone 226 has a narrow end near the receiver 220and the broad end located near the transmitter 218 as shown in brokenlines in FIGS. 11, 13, and 14.

According to some embodiments of the present invention, the transmitter218 is mounted on a fork truck 216. When the fork truck 216 is locatedwithin the zone 226, the transmitter 218 can communicate with thereceiver 220. Mounted on the fork truck 216 is a controller 224operatively connected to the transmitter 218. The controller 224 can beoperatively connected to the transmitter 218 by a wire system or somesuitable wireless configuration. Preferably, the connection between thecontroller 224 and the transmitter 218 is a wired connection. In someembodiments of the invention, the controller 224 is a compact controllerwith the controls and actuators similar to those found on the controlpanel 214.

The controller 224 has actuators and selector switches that will permitthe operator of the fork truck 216 to operate the dock leveler 208, thevehicle restraint, 212, the dock door 214 and any other pieces ofloading dock equipment that may be desired to be operated such aslights, fans, a barrier or the like. Alternative embodiments of thepresent invention will include a controller 224 similar to the controlpanels already described herein having an automatic mode or beingconfigured to automatically control loading dock equipment.

According to one embodiment of the present invention, controller 224will include a single actuating button with a selector switch forselecting which piece of loading dock equipment to operate such as adock leveler 208, the dock door 210 or vehicle restraint 212.

According to one embodiment of the present invention, the operation ofthe system 201 is as follows. A transport vehicle will back up to theloading dock 200. Initially, the dock leveler 208 is in stored position,the restraint 212 is in the stored position, and the door 210 is closed.Assuming the cargo doors of the vehicle are open, the first operationwill be to restrain the vehicle. An operator of the fork truck 216 canactuate an actuator on the controller 224 which will cause the restraint212 to engage the trailer. Whether the restraint 212 is a hook typerestraint as shown in FIG. 11 which will engage the RIG on the traileror another restraint 212 such as a wheel chock type restraint which willcause a chock to block a wheel of the trailer, it does not matter, asany suitable restraint 212 may be used in accordance with the invention.Once the restraint 212 has engaged the trailer, interior lights willdisplay green to let dock workers know the trailer is restrained.Exterior lights will display red to let the vehicle operator know thatthe vehicle is restrained and that the vehicle and should not be drivenaway. The dock door 210 is opened by the operator by actuating anactuator on the remote control panel 224. The door control relay maycause a transmit a signal and cause the door 210 to fully open. Once thedoor 210 is opened, the dock leveler 208 is actuated to create a bridgebetween the dock floor 202 and the vehicle bed.

According to some embodiments the present invention, operation of thedock leveler occurs as follows. The operator will press and hold abutton on the remote controller 224. A signal will be transmitted fromthe transmitter 218 and may be maintained as long as the operator holdsthe button down. Continuing to hold the button on the remote controller224 will cause the dock leveler 208 to raise up from the stored positionand when the dock leveler arrives at a certain point the lip will extendfrom its pendent position. Optionally, the dock leveler 208 is raised toa satisfactory position by the operator pressing a button on the remotecontroller 224. The operator will release the button on the remotecontrol 224 and the dock leveler 208 will descend with the lip extendedcausing the lip to rest on the bed of the vehicle. In some embodimentsthe invention, it may not be desired to rest the lip on the bed of thevehicle. For example, if an end load condition occurs, the lip can beretracted or brought back to its pendent position by actuating anactuator on the remote control 224.

Once the vehicle is ready to leave the dock 200, the operator will pressa button on the remote controller 224. A signal will be maintained andtransmitted by the transmitter 218 as long as the operator continues topress the button. The signal will cause the motor on the dock leveler208 to start to raise the dock leveler 208. The dock leveler 208 willraise and the lip will drop to its pendent position. At this point, theoperator can release the button on the remote controller 224 and thedock leveler 208 will lower into its stored position. Sensors associatedwith the dock leveler 208 will then cause the dock leveler to send asignal to the control panel 214 that the dock leveler 208 is again inthe stored position.

The operator will then actuate the remote control panel 224 and thiswill cause the door relay to transmit a signal and the door 210 willthen close. Once the door 210 has started to close the operator canagain actuate a control on the remote controller 224 which will causethe vehicle restraint 212 to release the vehicle. Once the vehiclerestraint 212 has released the vehicle, interior lights will change tored indicating to dock workers that the vehicle is no longer secured tothe loading dock 200 and the exterior lights will change to greenindicating to a vehicle operator that the vehicle is no longerrestrained and can be pulled away from the loading dock 200.

According to one embodiment of the present invention, the remote control224 will be laid out similar to, and have all the actuators of, themaster control panel 214. Preferably, the remote control 224 will havepush buttons and/or selector switches as actuators. Preferably, theremote controller 224 will have a restraint “engage” and “release”actuators a “lights only” actuator, a “door open” actuator, and a dockleveler “raise” and “lip extend” actuators, and a “stop” actuator forstopping the dock leveler 208.

Some embodiments of the present invention will include remotecontrollers 224 that will be small portable versions of master controlpanels described above and shown in FIGS. 2-7 in more detail.

According to some embodiments of the present invention, the receiver 220is an infrared type receiver. However, the receiver 220, while referredto as a receiver, it is not limited to receiving functions only, but insome embodiments may also transmit messages to the controller 224.Preferably, the receiver 220 is an infra red type receiver that has azone in which it is able to receive a transmitted infra red signal.

The zone 226 is preferably conical with the small portion of the conestarting at the receiver 220 and become progressively broader as itextends away from the receiver 220. Optionally the zone 226 may be anysuitable shape and is not limited to a conical shape. In an exemplaryembodiment of the invention, the receiving zone 226 has a diameter ofabout 10 feet at the floor 202. This diameter is illustrated byreference numeral 230 in FIG. 11. Because the transmitter 218 is locatedon top of a fork truck 216, the diameter of the zone 226 is smaller atthe location of the transmitter 218 than it is at the floor 202.According to one exemplary embodiment of the present invention, thediameter of the zone 226 at the height of the transmitter 218 is about 6feet. The height of the transmitter 218 is about 8 feet or so above thefloor 202 and noted by reference numeral 228. In an exemplary embodimentof the present invention, the height between the ceiling 204 and thefloor 202 of the loading dock 200 is about 20 feet.

In some embodiments of the present invention, the location of the zone226 is indicated by indicia 232 illustrating the outline of theboundaries of the zone 226 as it intersects with floor 202. FIG. 12illustrates where the zone 226 is indicated on the floor 202 by indicia232. The indicia 232 is located just in front of the dock leveler 208.The indicia 232 can be paint, chalk, tape, etching in the floor, or anyother suitable way of marking the boundaries of the zone 226. The entirezone 226 may be filled in by the indicia 232 or just the boundaries maybe illustrated according to the individual desires or requirements of aparticular installation. Because the preferred zone 226 is in a conicalshape, the zone 226 when put on a flat surface such as a dock floor 202is in the shape of a conic section such as a circle or other conicsection. If the receiver 220 is configured to receive signals broadcaststraight up from it, then the zone 232 is likely to be in the shape of acircle. If the receiver 220 is canted at an angle then the zone 226 islikely to intersect with the floor 202 as an ellipse rather than acircle.

FIG. 13 illustrates one way for controlling the size and shape of thezone 226. A transmitter 220 is mounted via a bracket 234 to a ceiling204 of a dock 200. The receiver 220 receives its signal through a hollowtube 238. The hollow tube 238 may be attached to a housing 236 which canbe directly attached to the ceiling 204 and may also be attached to thebracket 234 upon which the receiver 220 is also attached. Changing thelength shape, and angle of the tube 238 will effect the size and shapeof the zone 226. One skilled in the art will make appropriate designchoices with respect to the tube 238 (including whether to use one atall) in order to fit the requirements of an individual installation.

According to some embodiments of the invention, the range or distance bywhich the transmitter can transmit a signal is not used when definingthe zone 226.

FIG. 14 shows one optional embodiment of the present invention. In FIG.14 a loading dock 200 is shown with a control system 201. Control system201 includes a infra red receiver 220 attached to a wall 206 of theloading dock 200. The infrared receiver 220 is connected to the mastercontrol panel 214 via a phone line 222.

In some embodiments of the present invention, the receiver 220 and themaster control panel 214 may be in communication through other meanssuitable to accomplish the invention. Other communication means may bewireless or otherwise. As shown in FIG. 14, the infrared receiver 220 ismounted to the wall 206 and configured to receive a signal from areflector 240. In some embodiments the invention, the reflector 240 maybe a mirror. The reflector 240 is attached to the ceiling 204 by areflector bracket 246. The reflector 240 is connected to a reflectorhousing 242. The reflector housing 242 is pivotally connected to thereflector bracket 246 by a pivot 244.

In some embodiments the invention, the reflector 240 may be fixed orconnected in a manner that is not pivoting but permits movement ofreflector 240 to adjust how a signal is reflected by the reflector 240.Dashed lines illustrate boundaries of zone 226 where transmitter 218(the transmitter 218 not shown in FIG. 14, but shown in FIG. 1 1) mustbe located in order for a signal to be read by the infrared receiver220. If an infrared signal is sent outside the zone 226, the signal willnot be reflected by the reflector 240 back to the infrared receiver 220.However, if the infrared transmitter 218 does transmit a signal withinthe zone 226 then infrared signal will be reflected by the reflector 240back to the infrared receiver 220.

Line 228 illustrates the size of the zone 226 at the height an infraredtransmitter 218 is located in accordance with one embodiment of theinvention where the infrared transmitter 218 is located on the top of afork truck 216. Dimension 230 illustrates the magnitude of the zone 226at the level of the floor 202 of the loading dock 200.

To aid a fork truck driver in ensuring that the infrared transmitter 218located on the top of the fork truck 216 is within the zone 226, indicia232, as shown in FIG. 12, may be marked on the floor 202 indicating thelocation of the zone 226. The indicia 232 may be marked lines along theouter boundaries of the zone 226, marking of a solid shape indicatingthe location of the zone 226, or any other suitable indicia of thelocation of the zone 226. The indicia 232 allow the fork truck driver toknow where to drive the fork truck 216 to have the transmitter 218within the zone 226.

Other than the use of a reflector 240 rather than a direct signal fromthe transmitter 218 to the receiver 220, the embodiment shown in FIG. 14operates substantially similar to that as shown and described in FIG.11.

According to another embodiment of the present invention, radio signalsmay be used instead of infrared signals. The embodiment shown in FIG. 15uses radio signals transmitted by a transmitter. Three receivers 248,249 and 250 are placed at different parts of the loading dock 200 wherethey both receive the radio signal transmitted by the transmitter. Whena signal is transmitted by a transmitter, it is sent out in alldirections. Signal receiving stations 248, 249, and 250 receive thesignal. The location from which the signal is sent is determined by useof triangulation techniques. Lines 252, 253, and 254 are representativeof the distance from which the signal was sent to receivers 248 and 250when the transmitter is located in the center of the zone illustrated bythe indicia 232. Arrowheads on lines 252, 253, and 254 indicate thedirection of travel of the signal. By calculating the point ofintersection between the three signals (the ones received by receiver248, 249, and 250) a processor can be programmed to determine where thesignal was transmitted from. A processor can further be programmed todetermine whether the signal was transmitted from a predefined equipmentoperation zone illustrated by indicia 232. If the signal was transmittedfrom within the predetermined zone 232, the system 201 will beresponsive to the signal. If, however, the signal was transmitted froman area other than the predetermined zone then the system 201 willignore the transmitted signal. Size and location of the zone can beprogrammed into the processor controller and modified according to theindividual needs of particular installation. Other configurations ofreceivers and transmitters may be used by one skilled in the art afterreviewing this disclosure to achieve a configuration in accordance withthe invention.

In some embodiments of the invention, multiple bays at a single loadingdock 200 can be controlled by the same remote controller. Each bay willhave a corresponding zone. When a signal is sent by a transmitter, thereceiving stations 248, 249, and 250 will determine if the signal wasreceived within a particular zone and if so, the equipment associatedwith that zone to be responsive to the signal.

The many features and advantages of the invention are apparent from thedetailed specification, and thus, it is intended by the appended claimsto cover all such features and advantages of the invention which fallwithin the true spirit and scope of the invention. Further, sincenumerous modifications and variations will readily occur to thoseskilled in the art, it is not desired to limit the invention to theexact construction and operation illustrated and described, andaccordingly, all suitable modifications and equivalents may be resortedto, falling within the scope of the invention.

1. A remote control system comprising: a receiver operatively connectedto equipment to be controlled by the system; a remote control configuredto communicate with the receiver to control the equipment; a transmitteroperatively connected to the remote control; and a zone locatedproximate to the equipment to be controlled by the system defined by atleast one receiver and remote control wherein the remote control and thereceiver communicate with each other when the transmitter is located inthe zone and can not communicate with each other when the transmitter isnot in the zone and the zone is not defined by a range associated withthe transmitter.
 2. The system of claim 1, further comprising indiciamarked on a surface indicating at least one boundary of the zone.
 3. Thesystem of claim 1, wherein the system operates loading dock equipment.4. The system of claim 3, wherein the remote control is located on afork truck.
 5. The system of claim 4, wherein the transmitter is locatedon the fork truck and transmits the signal substantially straight up. 6.The system of claim 3, wherein the receiver is configured to communicatewith a control panel associated with loading dock equipment.
 7. Thesystem of claim 6, wherein the receiver communicates with the controlpanel via a phone cord.
 8. The system of claim 2, wherein the indiciaare located on a floor and is shaped as a conic section.
 9. The systemof claim 8, wherein the indicia is shaped into a circle.
 10. The systemof claim 1, wherein the receiver comprises at least three radioreceivers that triangulate a radio signal sent by the remote control.11. The system of claim 1, wherein the receiver and the remote controlcommunicate via an infrared signal.
 12. The system of claim 11, whereinthe infrared signal is transmitted through a tube and an inner diameterof the tube limits a diameter associated with the signal and therebylimits a size of the zone.
 13. The system of claim 11, furthercomprising a reflector configured to reflect the signal between thereceiver and the remote control.
 14. The system of claim 2, wherein theindicia have a radius of about 5 feet.
 15. The system of claim 1,further comprising a plurality of receivers and zones wherein each zonecorresponds with one and only one receiver and the remote control isconfigured to operate equipment associated with each receiver when thetransmitter is the zone associated with a particular receiver.
 16. Thesystem of claim 1, wherein the receiver is operatively connected to acontrol panel configured to control the equipment.
 17. The system ofclaim 14, wherein the receiver is operatively connected to the controlpanel via a telephone wire.
 18. A loading dock control systemcomprising: an infrared transmitter attachable to a fork truck andconfigured to transmit an infra red signal substantially straight up; aremote dock loading equipment controller operatively connected to thetransmitter; and a receiver mountable in proximity to a loading docksuch that when mounted, the receiver will only be able to receive asignal from the transmitter when the transmitter is located with in adefined zone, the receiver configured to be operatively connected to acontrol panel located at the loading dock and controlling loading dockequipment.
 19. The system of claim 18, further including indicia on afloor of the loading dock indicating at least of boundary of the definedzone.
 20. A control system comprising: means for transmitting attachableto a fork truck and configured to transmit a signal substantiallystraight up; equipment controlling means operatively connected to thetransmitting means; and receiving means mountable with in a loading docksuch that when mounted, the receiving means will only be able to receivea signal from the transmitting means when the transmitting means islocated with in a defined zone, the receiving means configured to beoperatively connected to a control panel located at the loading dock andcontrolling loading dock equipment.
 21. A method of remotely controllingdock loading equipment comprising: operating loading dock equipment witha controller located on a fork truck.
 22. The method of claim 20 furthercomprising moving the fork truck to a pre-determined zone beforeoperating the loading dock equipment.
 23. The method of claim 22,further comprising marking on loading dock floor at least one boundaryof the zone that the controller with work to operate the loading dockequipment.